Speech-Like Rhythm in a Voiced and Voiceless Orangutan Call Lameira, Adriano R. ; Hardus, Madeleine E. ; Bartlett, Adrian M. ; Shumaker, Robert W. ; Wich, Serge A. ; Menken, Steph B. J. Abstract Publication: PLoS ONE Pub Date: January 2015 DOI: 10.1371/journal.pone.0116136 Bibcode: 2015PLoSO..10k6136L